# help
help(abs)
'''
Help on built-in function abs in module builtins:

abs(x, /)
    Return the absolute value of the argument.
'''

# abs
print(abs(1))  # 1
print(abs(-1))  # 1

# max
print(max(1, 2, 3, 4, 5))  # 5

# transfer
print('123')
print(123)
print(bool(''))  # False
print(bool(1))  # True
print(int(1.23))  # 1
print(str(1.23))  # 1.23
print(str(123) + '4')  # 1234
print(int('123') + 4)  # 127

# 别名,函数名其实就是指向一个函数对象的引用，完全可以把函数名赋给一个变量，相当于给这个函数起了一个“别名”
a = abs
print(a(-1))  # 1

